magent
Johansen 1990 Mangled Extremity Severity Score (MESS): caller-assigned skeletal/soft-tissue energy 1-4, limb ischemia 1-3 (doubled if ischemia time >6 hours), shock 0-2, and age points (<30 → 0, 30-50 → 1, >50 → 2). Max 14. MESS ≥7 predicted amputation with 100% accuracy in that series (mess_band 0-6 or >=7). Deterministic published arithmetic with citation. Not an amputation or limb-salvage protocol; magent does not examine the limb. Not later papers' cutoff of 8.
SearchLiveeip155:8453Exactvia cdp
MessTraumaIschemiaEmergencyCalculator
Calls · 30d
3→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 14 snapshots so far.
$13.75
Verified settled volume
2,750 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0050
Listed price
As published in the catalog. Always read the live 402 before paying.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-31 13:32Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x836Be278f1739fB4308091cD1852F7971Bc19Ee2The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "PAYMENT-SIGNATURE header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2",
"paymentFlow": "upfront",
"resourceUrl": "https://api.magentlab.com/api/calc/mess",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
},
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2",
"withdrawDelay": 86400,
"receiverAuthorizer": "0x3721824a31197dcDD2984cF43b92B6cc8A87c0Fb",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "batch-settlement",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
],
"resource": {
"url": "https://api.magentlab.com/api/calc/mess",
"tags": [
"mess",
"trauma",
"ischemia",
"emergency",
"calculator"
],
"mimeType": "application/json",
"description": "Johansen 1990 Mangled Extremity Severity Score (MESS): caller-assigned skeletal/soft-tissue energy 1-4, limb ischemia 1-3 (doubled if ischemia time >6 hours), shock 0-2, and age points (<30 → 0, 30-50 → 1, >50 → 2). Max 14. MESS ≥7 predicted amputation with 100% accuracy in that series (mess_band 0-6 or >=7). Deterministic published arithmetic with citation. Not an amputation or limb-salvage protocol; magent does not examine the limb. Not later papers' cutoff of 8.",
"serviceName": "magent"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"age": 25,
"shock": 0,
"limb_ischemia": 1,
"ischemia_over_6h": false,
"skeletal_soft_tissue": 1
}
},
"output": {
"type": "json",
"example": {
"age": 25,
"score": 2,
"shock": 0,
"formula": "mess",
"citation": {
"id": "johansen-1990",
"doi": "10.1097/00005373-199005000-00007",
"pmid": "2342140",
"title": "Objective criteria accurately predict amputation following lower extremity trauma",
"source": "J Trauma. 1990;30(5):568-572",
"authors": "Johansen K, Daines M, Howey T, Helfet D, Hansen ST"
},
"max_score": 14,
"mess_band": "0-6",
"age_points": 0,
"components": [
{
"value": 1,
"factor": "skeletal_soft_tissue",
"points": 1,
"present": true
},
{
"value": 1,
"factor": "limb_ischemia",
"points": 1,
"doubled": false,
"present": true
},
{
"value": 0,
"factor": "shock",
"points": 0,
"present": false
},
{
"value": 25,
"factor": "age",
"points": 0,
"present": false
}
],
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"limb_ischemia": 1,
"ischemia_points": 1,
"ischemia_over_6h": false,
"formula_expression": "MESS = skeletal_soft_tissue (1-4) + limb_ischemia (1-3, doubled if ischemia_over_6h) + shock (0-2) + age_points (<30 → 0, 30-50 → 1, >50 → 2); Johansen 1990 band 0-6 / >=7; max 14",
"skeletal_soft_tissue": 1
}
},
"iconUrl": "https://api.magentlab.com/favicon.ico"
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"queryParams": {
"type": "object",
"required": [
"skeletal_soft_tissue",
"limb_ischemia",
"shock",
"age",
"ischemia_over_6h"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (integer 0-120). Johansen 1990 points: <30 → 0, 30-50 → 1, >50 → 2. Not the adult 18-120 clamp."
},
"shock": {
"type": "integer",
"description": "Caller-assigned Johansen 1990 shock (integer 0 SBP always >90, 1 transient <90, or 2 persistent <90)."
},
"limb_ischemia": {
"type": "integer",
"description": "Caller-assigned Johansen 1990 limb ischemia (integer 1 pulse reduced but perfusion normal, 2 pulseless with paresthesia, or 3 cool paralyzed insensate). Doubled when ischemia_over_6h is true."
},
"ischemia_over_6h": {
"type": "boolean",
"description": "true if limb ischemia time is greater than 6 hours (Johansen 1990 doubles the ischemia score). true or false as assigned by the caller."
},
"skeletal_soft_tissue": {
"type": "integer",
"description": "Caller-assigned Johansen 1990 skeletal/soft-tissue energy (integer 1 low, 2 medium, 3 high, or 4 very high). magent does not examine the limb."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.005USDC≈ $0.005 USD
on Base · exact scheme
Pay 0.005 USDC on Base to 0x836B…19Ee2. The signed payment is good for 10 minutes.
- Paid to
- 0x836B…19Ee2
- USD Coin contract
- 0x8335…02913
- Payment window
- 10 minutes
- As published
- 5000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2",
"paymentFlow": "upfront",
"resourceUrl": "https://api.magentlab.com/api/calc/mess",
"assetTransferMethod": "eip3009"
},
"payTo": "0x836Be278f1739fB4308091cD1852F7971Bc19Ee2",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"items": [
{
"age": 25,
"shock": 0,
"limb_ischemia": 1,
"ischemia_over_6h": false,
"skeletal_soft_tissue": 1
},
{
"age": 25,
"shock": 0,
"limb_ischemia": 1,
"ischemia_over_6h": false,
"skeletal_soft_tissue": 1
}
]
},
"type": "http",
"method": "POST"
},
"output": {
"type": "json",
"example": {
"path": "/api/calc/mess",
"count": 2,
"items": [
{
"age": 25,
"score": 2,
"shock": 0,
"formula": "mess",
"citation": {
"id": "johansen-1990",
"doi": "10.1097/00005373-199005000-00007",
"pmid": "2342140",
"title": "Objective criteria accurately predict amputation following lower extremity trauma",
"source": "J Trauma. 1990;30(5):568-572",
"authors": "Johansen K, Daines M, Howey T, Helfet D, Hansen ST"
},
"max_score": 14,
"mess_band": "0-6",
"age_points": 0,
"components": [
{
"value": 1,
"factor": "skeletal_soft_tissue",
"points": 1,
"present": true
},
{
"value": 1,
"factor": "limb_ischemia",
"points": 1,
"doubled": false,
"present": true
},
{
"value": 0,
"factor": "shock",
"points": 0,
"present": false
},
{
"value": 25,
"factor": "age",
"points": 0,
"present": false
}
],
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"limb_ischemia": 1,
"ischemia_points": 1,
"ischemia_over_6h": false,
"formula_expression": "MESS = skeletal_soft_tissue (1-4) + limb_ischemia (1-3, doubled if ischemia_over_6h) + shock (0-2) + age_points (<30 → 0, 30-50 → 1, >50 → 2); Johansen 1990 band 0-6 / >=7; max 14",
"skeletal_soft_tissue": 1
},
{
"age": 25,
"score": 2,
"shock": 0,
"formula": "mess",
"citation": {
"id": "johansen-1990",
"doi": "10.1097/00005373-199005000-00007",
"pmid": "2342140",
"title": "Objective criteria accurately predict amputation following lower extremity trauma",
"source": "J Trauma. 1990;30(5):568-572",
"authors": "Johansen K, Daines M, Howey T, Helfet D, Hansen ST"
},
"max_score": 14,
"mess_band": "0-6",
"age_points": 0,
"components": [
{
"value": 1,
"factor": "skeletal_soft_tissue",
"points": 1,
"present": true
},
{
"value": 1,
"factor": "limb_ischemia",
"points": 1,
"doubled": false,
"present": true
},
{
"value": 0,
"factor": "shock",
"points": 0,
"present": false
},
{
"value": 25,
"factor": "age",
"points": 0,
"present": false
}
],
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"limb_ischemia": 1,
"ischemia_points": 1,
"ischemia_over_6h": false,
"formula_expression": "MESS = skeletal_soft_tissue (1-4) + limb_ischemia (1-3, doubled if ischemia_over_6h) + shock (0-2) + age_points (<30 → 0, 30-50 → 1, >50 → 2); Johansen 1990 band 0-6 / >=7; max 14",
"skeletal_soft_tissue": 1
}
]
}
},
"iconUrl": "https://api.magentlab.com/favicon.ico"
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"body": {
"type": "object",
"required": [
"items"
],
"properties": {
"items": {
"type": "array",
"items": {
"type": "object",
"required": [
"skeletal_soft_tissue",
"limb_ischemia",
"shock",
"age",
"ischemia_over_6h"
],
"properties": {
"age": {
"type": "integer",
"description": "Age in years (integer 0-120). Johansen 1990 points: <30 → 0, 30-50 → 1, >50 → 2. Not the adult 18-120 clamp."
},
"shock": {
"type": "integer",
"description": "Caller-assigned Johansen 1990 shock (integer 0 SBP always >90, 1 transient <90, or 2 persistent <90)."
},
"limb_ischemia": {
"type": "integer",
"description": "Caller-assigned Johansen 1990 limb ischemia (integer 1 pulse reduced but perfusion normal, 2 pulseless with paresthesia, or 3 cool paralyzed insensate). Doubled when ischemia_over_6h is true."
},
"ischemia_over_6h": {
"type": "boolean",
"description": "true if limb ischemia time is greater than 6 hours (Johansen 1990 doubles the ischemia score). true or false as assigned by the caller."
},
"skeletal_soft_tissue": {
"type": "integer",
"description": "Caller-assigned Johansen 1990 skeletal/soft-tissue energy (integer 1 low, 2 medium, 3 high, or 4 very high). magent does not examine the limb."
}
}
},
"maxItems": 25,
"minItems": 1
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"const": "POST"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-08-31 13:32Z
- Last indexed by Roundhouse
- 2026-09-07 06:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 20:45Z
- x402 version
- 2
- Max timeout
- 600s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 14 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service magent and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=magent' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://api.magentlab.com/api/calc/mess, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.